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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668c0dd92713f56aaf4e2aace5b5a445e71a82d7914d93da186568bdcea32863' 
  AND token = '3rejdga0udX2QPqp0zI/uqIGcCX5nhGijI1+vA2O9CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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