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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b57b80a0709204a8c2f5145f6a06a9d8d51c76bed911e1c5218e5353f8c647' 
  AND token = '3ldx03pEhvJYBNPl0tdm1ngBzXkTOSrLfxVjerEQN2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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