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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a639cbcc9f5295c9969847747031ac408539f6dd423039cedf19c6168ece5a' 
  AND token = 'z4zOihU/wH5lh6VI9VFxwvyxRBpmR6oSJ7SLDWMUCL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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