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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43b8e5b2bf7c1d2fae7ae868d797a8dbf5285d1a0e06dd8825dc83ebe8bd93c' 
  AND token = 'OPXQDG/Dw7l41x+piirq5gdyYvvVs80SGOJEKjQT74o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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