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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7aaf045ce9e0b83bd987b0963dfb001ffd5602ef8a06a1b8d57602262046e5f' 
  AND token = 'i5qcBh3Im1jxLrWpC3ejXMH+oXGmhsdSaJuiAgB7stQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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