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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ad057ef16707017967ec3aaab3e6f44cca879103a662361ae1ba06ac3e94fb' 
  AND token = 'hefRb95Rt4wVrVa7bSjBBt3BAsu+2TWUX18DKakphSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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