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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fa8f847ff755caf9c38ed57fdd9d2bc5fe6b0aeba00400d5089fe7187376af' 
  AND token = 'GjDzpCmlmXZ+Xb++XAQC8erc/3BaSXYhFgAYQ8t+uT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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