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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639042893af999bb88a1f761e969d836053ea3d64282d61e437a9a3a0d822bac' 
  AND token = 'vVx3qGHeZ1vV5RJO4FB0j9Ar6h0/8A1GPNdi+V2JBqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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