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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9063f769d232c5f40fed8fdeafcf802e2a65f33e7f3eb3d6ef9bcf80058b0d' 
  AND token = 'p0NENTcXA5XK7OPiQmfMgt6/z4UfJ9HVVthtrel4FB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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