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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0833836ce18fbbaacb22b8980d2bd53fb98bc76b922269cea8e2cc3d5ca1bcac' 
  AND token = '+TOO/PpSAl8fA1k+v625dG/Sip4sFrPTshkD51zU5mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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