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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a00dc2e7fa5d113879a5f9a88cee03efd47914775345eefbfbb10a8a21aaf9' 
  AND token = 'kYw5nt/7RMTlz/O5itI9juD1IkyTSugb1rVynYE2/cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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