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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408250445c7f96c606166837b64eeff9f261add498ece8ccc304bbbb111940b8' 
  AND token = 'wskVFNkOQ1C8ad5C0qEMn9rtOI4y/vwqcL233QybWzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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