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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5ca04ba9ae69d3c3b905082d3d5dacbf9b8fa02bc988ac2fc7ec1cd08adc3c' 
  AND token = 'UnR902Bue810J3u7FJOzSZ/YURHP6nBPdsjVzw3tL50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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