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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ab3e44dfc64f0f68b1e751eba5dbc51c32b73effa05bf63fca9db6b99bc7eb' 
  AND token = 'H7oVjhAO8NybYLiZ/V6u1mGZhuiBP9s7vUyijsJPX08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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