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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37479cbfdf969adbdb5ff24219ffb0ee8b6541ac2305b9aa1e5514ae5dbbe5e9' 
  AND token = 'kJKuGya28iy6/CkdmfYAf8CydpJ6INO5wcBkIGwsoVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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