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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ceef73c4171208d078adccb14da49f74069f880129567d9d537e257733e5f4' 
  AND token = 'tNygzhrDVi7KU4T1ikwLCXsizorH/e/Kfk1BwvOqzkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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