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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f45cb0d1878328f541cce2c858b5559cbada60f6dfb44bca9992a80e1adf102' 
  AND token = 'Q6fPQj3npmq2jjXNlzRMGRq08ocJxDK9ACAYdv6JViA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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