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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4027b9f4280da007a07e288bcb5da0e05b478f78ff99a07f0990febe9f3874e7' 
  AND token = 'OxcV48QpRtAvBg5s0swsBisq4aUdmMh2JpmnSrQbbok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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