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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add33881483b972606b9d115584f50030d0ed1bf6b8035f9f1d70453abab4c7b' 
  AND token = '+q9S9i6DGPofcNCKCHpNpbSj08eGanySi57H/QSK2O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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