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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154a6801fc14c092a0b7b1bf8f028f3b114a88c98fef78267fbe43d4ce89125c' 
  AND token = '2J1Ep9U+ilCW0Upg4p2mfjVRoA7EN344V+Ey9RmfuRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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