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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611487da17cbc711035e84b064484fd8991c98a00bc3b100b0b845be7a39ee0d' 
  AND token = '1vw8L93TQhx0axxBJM/8dhNFFU5upVGz9D86EQB6gR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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