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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cca09e9996382135f6c9bcadda6b1e861291cbb79f8d97e5ee03390b62ccecc' 
  AND token = 'ShNWGMB7Z+t4u3wOL1qQ81+UV8Ul/ds/YarC5CttiF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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