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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524d3d0ab3af372668044966e29baba7fc588214dcd881ac1b3db4c3f7800d4d' 
  AND token = '8Ypy9h7EX7E1/cBayXuiJ5TD5rngR03t9GsH076hW/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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