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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d5b2fa73ac76ad5199fa050119da5395b09c528d66a013937138a5c3be48ed' 
  AND token = 'j+2bwAc3GNtgYbhR2d/H1E0Sx0yWa9tKHrak/QwCows=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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