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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4731c3319daf36edfd75ec4e6835d665929b7a5d6e3f9a50f826206f5cb000b6' 
  AND token = 'iLyqHp2Ep9O/jyvsSbSJJR2dR5G5l701FrDbsqRo0zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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