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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6f3c0f0dd750a8d4aa5f53db3a1bdfd0154e5c23e1e2dc0321915abb974062' 
  AND token = 'oMq9msso/dgEeQnrk9AtNa+T5AfwoWfUC2WG/KRpm5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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