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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f33f63e56318433e176a025c76c99a00bcff679000cb2ae7fdedecf9e27b4bb' 
  AND token = '2PlyMvhes73PXJZvpv95JuFd5ZPEEY+XPB09DT+KFM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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