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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6c19876a087cea61bef9821e6a0a1b6a6343a58855b22ba4acaea871330a60' 
  AND token = 'yxt05DySSDejaoUUU4IoznTZWbvKoxXG3N9vMN8QV3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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