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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf918e5a11d80dd1e4b0b2fad25d4838e23d3ef9f8cef8c05fb3a6f3979b6c0' 
  AND token = 'MOYWk/ZCpO6RMFOGUQHAzvFDsXqehF3KcK2ksxoQzZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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