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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4332d3914990298a230b8c55391a90b6263d5028eb7f0f66f46450788fe9bdf3' 
  AND token = '01Lc4Op7PfTfJqka8vyOHvrMjjkKjbBPYrfntcqUf0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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