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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7d35c3d3e58720f0bc73d2397070e0f3dbb2abe40f106a03fedd3d83dfe9cc' 
  AND token = 'fgqbi7DkwuedQ+R3CocaS7WBGczugQMLbSNq1i8fJZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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