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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6889c1a968bd854af26b02b39bcbd76ba2bc417ebf3a3a6408f9f6778060484e' 
  AND token = 'XEY5HPyhLfz8IC6oSaQ5YLgt6qcTUeW5MNq8FdAm610=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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