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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a261047a3477e0ddccd0952533cfa4b5019d696a9b51e9453d34390b43fd37' 
  AND token = '9rkMipUQkpLXNyRojAQ5eNMQ+OatWpA+iWgc94dh/pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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