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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf5a6aeba3db8ab776ff4ca10f35adc8a54a9b584b82f840248b698ba0a51e1' 
  AND token = '32V0me6yymzVdJkodHpKntENIvI455r5nabmPii0q/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}