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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760d3370fe0c35203d5188c0e493bcef27de7d447f06c47e579d28c1211c4520' 
  AND token = '1NY9i1rvNAfTf64VovTrpLOkciKnA+Y5GPXn6yujGTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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