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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177a5e7c071f001eefa60d0ea21aa6594004307e9a0711e675d6d38466f2e695' 
  AND token = '1wS3/kibJlvgPDQ7zU+h5MhzexUS2AmzygT5GEZgsto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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