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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6620b2bf6192c1f05d6db06f05d3dadd4c47f834d46cf0e30f06b80e68f4d5' 
  AND token = 'QtyoySdQgqAw0TS1Z9TMJE7UZXVtRQfG9JNA8VL4gPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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