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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f6d155310bbf719fe8ddd82b23a983e4a94943d37e99960c2fc2ce39ddbeda' 
  AND token = '2rf4Ob48CskcKEILfxntFUei4E4NSCaMnRfXee1iBwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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