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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca9bfd75a342a2e22d071121d0095af702363494f92a65075c62cd0a2104439' 
  AND token = 'Ff5z7Mn9d0ltSJFniofGRBukUUvW4YLg0phadREYuL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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