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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5b091974a8ae306f94a74c3806f1900b725607c7eb66cf73e01658adba3311' 
  AND token = 'YIGt2gfPnvzYd0pGtnS98gu1krMH1grcoUBaEtpWfOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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