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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f0b4802380d17135f28897dfeb13c853f01521c82ab2c5acaad903ab24905a' 
  AND token = 'x7Rn+4lG0O0IPcRKCfUCq3Mxu0mHU0vChwbR3pSqruQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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