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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686ce7cf3fa2e2310130ef80da67c91641a54b2f91ef5968628ea5aa650c0fcc' 
  AND token = 'fTJCayg4EjHI0Gd/WHpm/DYA28UwdsildsFAlj1AkrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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