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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bebd03591b28608fdb6af73277115e026670c9f24c4d1ae7d6b8a9017a4e76' 
  AND token = 'vbOPdXaeiyOtH2Jc9PR4Rw1xu4EQnLVOo70WeI58n5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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