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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa65d5af85710ff3ab998d38b8e7d909abf9468eeed7234d92822318ff690a5' 
  AND token = '6u7OiGBU8IzGngqYLAlNCY359OFlFT/cpWCENydGt4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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