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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72d1618d90a66ea7187545eb5cff919fa933f8939abff1770c14b406392dfff' 
  AND token = 'KWop5JJxCd7u0hXIhOFMyLzW4aif4M7qP3t5Cms5zaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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