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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cce71cdf5834948e6803e83ac13a5e30fd894ea5ecbb9ccb039420ca12e6cd5' 
  AND token = 'RuY3sTc8tSaCFKBIjxhlL2xJGTyyusSsnQF5qg9L0eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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