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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38375943bcc98c0fcb65a410e7ed02c61774a939d46ae49707e55d6a901ca375' 
  AND token = 'Lejn3p2+HulU56KtrGDOeWdyKK2vS4sBUkkpBmtPGFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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