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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fef6b1e7dd9e2a42d53533c1559806488500ece559456f8a81f555a451b3e0' 
  AND token = 'fXzp7KGCaEXu92xmv3acz/h9zhy4YF0zw/CiYNkfV1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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