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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd87a85f02f50a1914927f44cf8e0df4cc99493b492e2c3fac81dfe177c1cfb' 
  AND token = 'LEzBT3gjEt/O8Zw34aXzhq8NNded/PohWkKYPA4prD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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