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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4c3a45b7bc07f27cec7c7960103fbd0a6c735d85e54c465c595886adf7030b' 
  AND token = 'glCB6FafANF3+zrHo9bZDs6V9XRdgLylibc6KQqSFis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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