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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc9a8b3a06f2a77945260a27160311a088d0fbc4cd322a7eb80bde1e4e9b15b' 
  AND token = 'dfy3byAmLNmLRM4bfsWvtr/ri1jUanyHW81UhKp08X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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