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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ee0db6f006ec499699f2001e02e584ac8d7ea63d1665b49ba63ed85fc42052' 
  AND token = 'OjfbC/G225PJB2IZ551vJp5pUTBHJWpwA58V3Of4B6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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